/*
 * Copyright (c) 2016, 2017, 2018, 2019 FabricMC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.fabricmc.indigo.renderer.render;

import net.minecraft.block.Block;
import net.minecraft.block.BlockState;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.Direction;

public class TerrainBlockRenderInfo extends BlockRenderInfo {
    private int cullCompletionFlags;
    private int cullResultFlags;
    
    
    @Override
    public void prepareForBlock(BlockState blockState, BlockPos blockPos, boolean modelAO) {
        super.prepareForBlock(blockState, blockPos, modelAO);
        cullCompletionFlags = 0;
        cullResultFlags = 0;
    }
    
    @Override
    boolean shouldDrawFace(Direction face) {
        if(face == null) {
            return true;
        }
        final int mask = 1 << face.getId();
        
        if((cullCompletionFlags & mask) == 0) {
            cullCompletionFlags |= mask;
            if(Block.shouldDrawSide(blockState, blockView, blockPos, face)) {
                cullResultFlags |= mask;
                return true;
            } else {
                return false;
            }
        } else {
            return (cullResultFlags & mask) != 0;
        }
    }
}
